A 10-year-old boy was brought in by his father for evaluation of crampy abdominal pain, nausea and mild diarrhoea that had persisted for approximately 2 weeks. On the day before evaluation, the boy reported to his parents that he passed a large worm into the toilet during bowel movement. He flushed the worm before the parents could see it. Physical examination was completely unremarkable. The boy had no fever, cough or rash and did not complain of anal pruritus. His travel history was unremarkable. Examination of a stool specimen revealed the diagnosis. The boy is infected by which kind of parasite? Was this patient at risk of autoinfection? Why? Can this parasite cause extraintestinal symptoms? What are the major complications caused by the parasite?

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Parasitic infections

A parasite is an organism that lives in the body of another organism and obtains food at the expense of the host. There are two kinds of parasites they are internal and external. An internal parasite lives inside another organism and is known as endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite.